Printing Colorimetry Shutter With Positive-Pressure Protection
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Solution Overview
Problem
Ink particles can contaminate the mist prevention glass, leading to reduced colorimetry accuracy in image forming devices, and light dispersion can occur, affecting the precision of color measurement.
Innovation Solution
A printing device with a colorimetry section that includes a shutter to close an exposure opening, a pressurizing member to control air pressure within the case, and an intake section to manage airflow, reducing the entry of foreign matter onto the imaging element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent plate (mist prevention glass) is used to protect the imaging element, then the imaging element is protected from ink particle contamination, but the transparent plate becomes contaminated by ink particles and causes light dispersion, deteriorating colorimetry accuracy
Solution Approach 1:
The patent removes the transparent plate (mist prevention glass) from the optical path between the imaging element and the medium. By eliminating this intermediate component, the source of contamination and light dispersion is completely removed, allowing the imaging element to capture light directly from the medium without degradation of colorimetry accuracy.
Solution Approach 2:
The patent applies preliminary protective actions by using a pressurizing member to create positive pressure inside the case and employing a shutter to control the exposure opening. These measures prevent ink particles from reaching the imaging element before contamination can occur, eliminating the need for a transparent protective plate.
2Reliability
If the shutter remains closed to protect the imaging element, then contamination is prevented, but light cannot reach the imaging element for color measurement
Solution Approach 1:
The patent applies preliminary action by pressurizing the interior of the case before opening the shutter. This creates a positive pressure environment that prevents ink particles from entering when the shutter is opened, allowing the shutter to remain open during measurement without compromising protection.
Solution Approach 2:
The patent employs dynamic control of the shutter and pressurizing member coordination. The shutter is opened only after pressurization is established, and the timing is dynamically adjusted to ensure protection is maintained while enabling light access for colorimetry when needed.
3Measurement precision
If the exposure opening is open to allow light access for colorimetry, then color measurement is enabled, but ink particles can enter and contaminate the imaging element
Solution Approach 1:
The patent uses pneumatic pressure control by employing a pressurizing member to maintain positive pressure inside the case. This pneumatic barrier prevents ink particles from entering through the exposure opening even when the shutter is open, enabling both light access and contamination protection simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances colorimetry accuracy by minimizing contamination and light dispersion, allowing precise color measurement without the need for a transparent plate, thus maintaining high-quality image analysis.
Implementation Method 1
a pressurizing member configured to pressurize inside the case
Data Source
AI summary
A printing device 1 includes a printing section configured to print an image onto a medium by ejecting liquid and a colorimetry section 17 configured to measure color of the image, wherein the colorimetry section includes an imaging element 24 configured to capture the image, a case 21 configured to accommodate the imaging element, a shutter 23 attached to the case, and a pressurizing member 27 configured to pressurize inside the case, an exposure opening 22configured to expose the imaging element is formed in the case, the shutter is attached to the case so as to close the exposure opening, the pressurizing member is configured to pressurize inside the case in a state in which the shutter is closed, and the shutter is opened in a state in which inside the case is pressurized by the pressurizing member.